Groundwater remediation Groundwater contamination is the degradation of natural water quality as a result of human activities, and pollution occurs when contaminant concentration levels restrict the potential use of groundwater. Groundwater remediation aims to reduce contaminant concentrations to below the threshold standard for the intended use.Groundwater remediation  Groundwater contamination is the degradation of natural water quality as a result of human activities, and pollution occurs when contaminant concentration levels restrict the potential use of groundwater. Groundwater remediation aims to reduce contaminant concentrations to below the threshold standard for the intended use